About this item PERFECT DESIGN: Screws can be used to tighten the cable at the connection point to fix the cable firmly so that it is not easy to fall off. The button can cover the exposed wires, which not only looks good and tidy, but also protects the battery wires from external conditions and ensures trouble-free operation. PREMIUM MATERIAL: Body Body main is fully stamped copper, low resistance and high conductivity. The button is made of high quality PVC plastic, which has good flexibility. The product has a longer life and greater durability than ordinary alloys. HOW TO USE: Connect the power cord and install it on the head of the battery cell. When you need to replace the battery, you can remove the connector by pulling it. After replacing the battery, put on the battery head and press the button to plug and play. WIDE APPLICATION: This part can be installed in cars, boats, trucks and other equipment. The inner diameters of + pole and pole are 19mm and 17mm battery cell heads respectively. However, some models may be smaller. Please measure the cell head of your car battery before deciding to purchase the correct size. Simply select wire length and wire lug mounting hole diameter. SAFETY OPERATION: Our button marks on and off status. Pay attention to the positive and negative poles when installing. Make sure there is no confusion.